Alert archive / Virginia / Washington County
Weather alerts in Washington County, Virginia, 2009
122 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Washington County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 122
- Warnings
- 33
- Watches
- 22
- Advisories
- 45
- Busiest month
- June28 alerts
- Busiest day
- June 17, 200913 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 3 tornado warnings covering Washington County in 2009 had a tornado report inside them.
Washington County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 16 | 13 | 19% | 6 | 67% | 35 min |
| Flash flood warnings | 3 | 2 | 33% | 1 | 100% | 42 min |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Morristown, TN: tornado warnings | 41 | 11 | 73% | 14 | 93% | 22 min |
| NWS Morristown, TN: severe thunderstorm warnings | 335 | 252 | 25% | 434 | 87% | 26 min |
| NWS Morristown, TN: flash flood warnings | 39 | 29 | 26% | 59 | 76% | 75 min |
An office's figures cover every county it serves, including across state lines.
Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.
The alerts
Every alert, in the order issued. Times are local, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 2, 7:11 AM EST | Winter Weather Advisory | MRX | 5 hr |
| Jan 3, 12:43 AM EST | Dense Fog Advisory | MRX | 9 hr |
| Jan 5, 3:51 AM EST | Flood Watch | MRX | 51 hr |
| Jan 6, 5:55 PM EST | Areal Flood Warning | MRX | 16 hr |
| Jan 7, 3:05 PM EST | Winter Weather Advisory | MRX | 21 hr |
| Jan 10, 9:39 AM EST | Wind Advisory | MRX | 12 hr |
| Jan 10, 6:17 PM EST | Areal Flood Advisory | MRX | 3 hr |
| Jan 15, 3:18 AM EST | Wind Chill Advisory | MRX | 33 hr |
| Jan 17, 10:37 PM EST | Freezing Rain Advisory | MRX | 11 hr |
| Jan 18, 4:12 AM EST | Winter Weather Advisory | MRX | 63 hr |
| Jan 27, 2:57 PM EST | Wind Advisory | MRX | 22 hr |
| Feb 2, 10:38 AM EST | Winter Weather Advisory | MRX | 5 hr |
| Feb 2, 3:30 PM EST | Winter Storm Watch | MRX | 19 hr |
| Feb 2, 3:30 PM EST | Winter Weather Advisory | MRX | 3 hr |
| Feb 3, 4:28 AM EST | Winter Weather Advisory | MRX | 47 hr |
| Feb 3, 2:57 PM EST | Wind Chill Advisory | MRX | 22 hr |
| Feb 10, 2:56 PM EST | Wind Advisory | MRX | 45 hr |
| Feb 11, 1:59 PM EST | Tornado Watch | SPC | 7 hr |
| Feb 11, 4:34 PM EST | Mesoscale Discussion | SPC | 86 min |
| Feb 11, 5:35 PM EST | Severe Thunderstorm Warning | MRX | 55 min |
| Feb 11, 6:27 PM EST | Severe Thunderstorm Warning | MRX | 18 min |
| Feb 17, 3:45 PM EST | Wind Advisory | MRX | 26 hr |
| Feb 18, 4:38 PM EST | Severe Thunderstorm Warning | MRX | 28 min |
| Feb 21, 1:04 PM EST | Winter Weather Advisory | MRX | 21 hr |
| Feb 28, 3:07 PM EST | Winter Weather Advisory | MRX | 28 hr |
| Mar 12, 10:39 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 2, 5:02 AM EDT | Wind Advisory | MRX | 35 hr |
| Apr 5, 8:53 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 5, 10:29 PM EDT | Severe Thunderstorm Warning | MRX | 31 min |
| Apr 6, 12:24 PM EDT | Winter Weather Advisory | MRX | 33 hr |
| Apr 10, 2:51 PM EDT | Tornado Watch | SPC | 6 hr |
| Apr 10, 4:42 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Apr 10, 7:53 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Apr 12, 8:40 PM EDT | Wind Advisory | MRX | 18 hr |
| Apr 21, 2:17 PM EDT | Wind Advisory | MRX | 6 hr |
| May 5, 3:29 PM EDT | Flood Watch | MRX | 31 hr |
| May 7, 6:54 PM EDT | Areal Flood Advisory | MRX | 51 min |
| May 8, 6:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| May 8, 6:32 PM EDT | Tornado Watch | SPC | 7 hr |
| May 8, 8:30 PM EDT | Mesoscale Discussion | SPC | 90 min |
| May 8, 10:08 PM EDT | Tornado Warning | MRX | 52 min |
| May 8, 11:37 PM EDT | Mesoscale Discussion | SPC | 53 min |
| May 18, 9:22 PM EDT | Frost Advisory | MRX | 12 hr |
| May 28, 2:21 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 28, 4:54 PM EDT | Mesoscale Discussion | SPC | 66 min |
| May 28, 7:34 PM EDT | Mesoscale Discussion | SPC | 56 min |
| May 31, 2:54 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 8, 3:24 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jun 9, 5:49 PM EDT | Severe Thunderstorm Warning | MRX | 41 min |
| Jun 9, 6:30 PM EDT | Severe Thunderstorm Warning | MRX | 45 min |
| Jun 10, 6:15 PM EDT | Areal Flood Advisory | MRX | 2 hr |
| Jun 11, 12:18 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 11, 4:29 PM EDT | Severe Thunderstorm Warning | MRX | 46 min |
| Jun 15, 3:47 PM EDT | Areal Flood Advisory | MRX | 118 min |
| Jun 16, 5:57 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 16, 7:15 PM EDT | Severe Thunderstorm Warning | MRX | 60 min |
| Jun 16, 7:51 PM EDT | Tornado Warning | MRX | 54 min |
| Jun 16, 8:02 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jun 16, 8:17 PM EDT | Tornado Warning | MRX | 43 min |
| Jun 17, 10:01 AM EDT | Flash Flood Watch | MRX | 13 hr |
| Jun 17, 12:54 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 17, 2:54 PM EDT | Severe Thunderstorm Warning | MRX | 51 min |
| Jun 17, 3:17 PM EDT | Mesoscale Discussion | SPC | 28 min |
| Jun 17, 4:07 PM EDT | Mesoscale Discussion | SPC | 23 min |
| Jun 17, 5:44 PM EDT | Severe Thunderstorm Warning | MRX | 61 min |
| Jun 17, 6:04 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Jun 17, 6:16 PM EDT | Severe Thunderstorm Warning | MRX | 29 min |
| Jun 17, 6:49 PM EDT | Severe Thunderstorm Warning | MRX | 41 min |
| Jun 17, 7:30 PM EDT | Flash Flood Warning | MRX | 3 hr |
| Jun 17, 7:33 PM EDT | Severe Thunderstorm Warning | MRX | 57 min |
| Jun 18, 10:39 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 18, 2:28 PM EDT | Severe Thunderstorm Warning | MRX | 62 min |
| Jun 18, 3:14 PM EDT | Severe Thunderstorm Warning | MRX | 45 min |
| Jun 20, 2:12 PM EDT | Severe Thunderstorm Warning | MRX | 48 min |
| Jun 28, 4:04 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Jul 20, 6:20 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Jul 30, 3:14 PM EDT | Flood Watch | MRX | 24 hr |
| Jul 31, 8:28 AM EDT | Areal Flood Advisory | MRX | 3 hr |
| Jul 31, 11:21 AM EDT | Areal Flood Advisory | MRX | 3 hr |
| Aug 1, 3:04 PM EDT | Flood Watch | MRX | 12 hr |
| Aug 2, 7:13 AM EDT | Areal Flood Advisory | MRX | 2 hr |
| Aug 4, 4:29 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 4, 6:45 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Aug 11, 1:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Aug 11, 1:46 PM EDT | Areal Flood Advisory | MRX | 119 min |
| Aug 22, 4:05 AM EDT | Areal Flood Advisory | MRX | 115 min |
| Aug 22, 4:40 AM EDT | Flash Flood Warning | MRX | 110 min |
| Sep 18, 4:36 PM EDT | Areal Flood Advisory | MRX | 3 hr |
| Sep 19, 4:37 PM EDT | Areal Flood Advisory | MRX | 113 min |
| Sep 24, 9:04 PM EDT | Areal Flood Advisory | MRX | 116 min |
| Sep 24, 10:47 PM EDT | Flash Flood Warning | MRX | 2 hr |
| Sep 25, 5:24 AM EDT | Flash Flood Watch | MRX | 40 hr |
| Sep 26, 1:32 PM EDT | Areal Flood Warning | MRX | 6 hr |
| Sep 26, 7:16 PM EDT | Areal Flood Warning | MRX | 2 hr |
| Oct 8, 3:19 PM EDT | Wind Advisory | MRX | 30 hr |
| Oct 9, 4:27 PM EDT | Tornado Watch | SPC | 6 hr |
| Oct 9, 7:13 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Oct 9, 9:11 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Oct 16, 3:52 AM EDT | Freeze Warning | MRX | 30 hr |
| Oct 17, 10:30 AM EDT | Winter Weather Advisory | MRX | 17 hr |
| Oct 17, 3:16 PM EDT | Freeze Warning | MRX | 19 hr |
| Oct 17, 8:59 PM EDT | Freeze Watch | MRX | 13 hr |
| Oct 18, 10:00 AM EDT | Freeze Warning | MRX | 23 hr |
| Oct 19, 2:50 PM EDT | Freeze Warning | MRX | 18 hr |
| Nov 10, 4:39 AM EST | Flash Flood Watch | MRX | 32 hr |
| Nov 10, 8:17 PM EST | Areal Flood Advisory | MRX | 6 hr |
| Nov 11, 2:29 AM EST | Areal Flood Advisory | MRX | 3 hr |
| Nov 11, 2:53 AM EST | Wind Advisory | MRX | 18 hr |
| Nov 26, 1:51 PM EST | Wind Advisory | MRX | 24 hr |
| Dec 1, 3:10 PM EST | High Wind Warning | MRX | 36 hr |
| Dec 4, 3:00 PM EST | Winter Weather Advisory | MRX | 24 hr |
| Dec 7, 3:23 PM EST | High Wind Watch | MRX | 13 hr |
| Dec 8, 3:57 AM EST | High Wind Warning | MRX | 39 hr |
| Dec 10, 4:20 AM EST | Wind Advisory | MRX | 11 hr |
| Dec 13, 9:07 PM EST | Dense Fog Advisory | MRX | 13 hr |
| Dec 17, 2:47 AM EST | Winter Storm Watch | MRX | 26 hr |
| Dec 18, 4:18 AM EST | Winter Storm Warning | MRX | 44 hr |
| Dec 18, 1:32 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Dec 18, 7:22 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Dec 23, 3:39 PM EST | High Wind Warning | MRX | 44 hr |
| Dec 23, 3:39 PM EST | Wind Advisory | MRX | 48 hr |
| Dec 30, 2:12 PM EST | Winter Weather Advisory | MRX | 19 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20082010
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.